Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
ve cam » ve cac, va cam, ve cai
loc va » hoc va, luc va
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach o lang xa hoi. hieu ((ve cam) or (ve cham)) loc va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach o lang xa hoi. hieu ((ve cam) OR (ve cham)) loc va thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach o lang xa hoi. hieu ((ve cam) or (ve cham)) loc va thanh vi cua tre*.